Ultrix 600mm BNF BasicBIGGER FLIES EVEN BETTER! Soon after it was introduced, the UMX Ultrix became one of our most popular ultra micro models. There was, and still is, nothing else like it! The unique delta wing design excels at smooth sport flying, basic aerobatics, and even aggressive 3D all in the same flight. This scaled up version offers the same unique capabilities AND the advantages of a larger size. It's easier to fly because it's easier to see and handles more